The 1.7.5.1 manual says:
--porcelain::
Give the output in a stable, easy-to-parse format for scripts.
Currently this is identical to --short output, but is guaranteed
not to change in the future, making it safe for scripts.
However, this is not actually true. --porcelain differs from --short
in at least two ways, one of them significant.
--short is colorized when color.status = auto, while --porcelain is
not.
More importantly, --short reports file paths relative to the
current directory, while --porcelain reports file paths relative to
the root of the repository.
All of this was the case in 1.7.0.4 also, and presumably the versions
in between.
Mark Jason Dominus mjd@xxxxxxxxxx
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